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compiler used for learning the programming language Haskell

Helium is a functional programming language and a compiler designed
especially for learning Haskell. Quality of the error messages has
been the main concern both in the choice of the language features and
in the implementation of the compiler. The goal of the language and
the compiler is to let students (or anyone) learn functional
programming more quickly and with more fun.

Note: Helium does not support type classes yet. For that reason it is
incompatible with Haskell text books.